Do it yourself

Build it yourself: a surfaceable GPS, a submersible GPS and an optical meter. Simple technology that makes a dive more interesting.

A few ideas for enriching the underwater experience with a bit of technology

• DIY: a submersible GPSA submersible GPS made from a phone in a waterproof box: swim to a wreck on the surface and drop straight down onto it.
• DIY: a surfaceable GPSHow to build the GPS data logger used for most of the VIZ dive site maps, with example traces from Camp Cove and Bare Island.
• DIY: an optical meterMeasure macro subjects without a reference object, using the focus distance in your photo's EXIF data and a calibration curve.